[Solution] Thirty-five samples of size 7 each were taken from a fertilizer-bag-filling machine. The results were: Overall mean = 57.75 lb ; Average range
Question: Thirty-five samples of size 7 each were taken from a fertilizer-bag-filling machine. The results were: Overall mean = \(57.75 \mathrm{lb} ;\) Average range \(=1.78 \mathrm{lb}\).
- Determine the upper and lower control limits of the \(\bar{x}\) -chart, where \(\sigma=3\).
- Determine the upper and lower control limits of the \(R\) -chart, where \(\sigma=3\)
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